Patents by Inventor Krishna Rapaka

Krishna Rapaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Techniques for calculation of quantization matrices in video coding
    Patent number: 10567768
    Abstract: Techniques are disclosed for developing quantization matrices for use in video coding. According to these techniques a first quantization matrix may be derived from a second quantization matrix by scaling quantization values of the second quantization matrix by scaling parameters. The scaling parameters may increase according to distance between each matrix position and a matrix origin, they may be derived from characteristics of a video sequence to be coded, or both. The first quantization matrix may be communicated to a decoder. Thereafter, a video sequence may be coded predictively. As part of the coding, pixel data of the video sequence may be transformed to a plurality of frequency domain coefficients, and the frequency domain coefficients may be quantized according to the first quantization matrix.
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: February 18, 2020
    Assignee: Apple Inc.
    Inventors: Xiang Fu, Xiaohua Yang, Linfeng Guo, Francesco Iacopino, Krishna Rapaka, Felix Chou, Mukta Gore
  • Techniques for Calculation of Quantization Matrices in Video Coding
    Publication number: 20180302621
    Abstract: Techniques are disclosed for developing quantization matrices for use in video coding. According to these techniques a first quantization matrix may be derived from a second quantization matrix by scaling quantization values of the second quantization matrix by scaling parameters. The scaling parameters may increase according to distance between each matrix position and a matrix origin, they may be derived from characteristics of a video sequence to be coded, or both. The first quantization matrix may be communicated to a decoder. Thereafter, a video sequence may be coded predictively. As part of the coding, pixel data of the video sequence may be transformed to a plurality of frequency domain coefficients, and the frequency domain coefficients may be quantized according to the first quantization matrix.
    Type: Application
    Filed: April 14, 2017
    Publication date: October 18, 2018
    Inventors: Xiang Fu, Xiaohua Yang, Linfeng Guo, Francesco Iacopino, Krishna Rapaka, Felix Chou, Mukta Gore